WO2023032560A1 - Dispositif de transformation d'aliment - Google Patents

Dispositif de transformation d'aliment Download PDF

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Publication number
WO2023032560A1
WO2023032560A1 PCT/JP2022/029611 JP2022029611W WO2023032560A1 WO 2023032560 A1 WO2023032560 A1 WO 2023032560A1 JP 2022029611 W JP2022029611 W JP 2022029611W WO 2023032560 A1 WO2023032560 A1 WO 2023032560A1
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WO
WIPO (PCT)
Prior art keywords
catalyst
rotation axis
reaction vessel
members
stirring body
Prior art date
Application number
PCT/JP2022/029611
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English (en)
Japanese (ja)
Inventor
大輔 猪野
邦弘 鵜飼
泰宏 橋本
覚 山路
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to EP22864147.8A priority Critical patent/EP4397191A1/fr
Priority to JP2023545172A priority patent/JPWO2023032560A1/ja
Priority to CA3228781A priority patent/CA3228781A1/fr
Publication of WO2023032560A1 publication Critical patent/WO2023032560A1/fr
Priority to US18/444,613 priority patent/US20240245078A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B4/00—General methods for preserving meat, sausages, fish or fish products
    • A23B4/015—Preserving by irradiation or electric treatment without heating effect
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/015—Preserving by irradiation or electric treatment without heating effect
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/001—Details of apparatus, e.g. for transport, for loading or unloading manipulation, pressure feed valves
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/26—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating
    • A23L3/28—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating with ultraviolet light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • B01F27/11252—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis paddle wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Definitions

  • This disclosure relates to food processing equipment.
  • Patent Document 1 describes a continuous water treatment device equipped with an ultraviolet lamp.
  • This water treatment apparatus is equipped with a reaction tank, an ultraviolet lamp, a stirring blade, a sedimentation separation tube, and a drainage pump.
  • a liquid to be treated is received in a reaction tank.
  • the photocatalyst particles are put into the liquid to be treated, and are dispersed and flowed in the liquid to be treated by stirring blades.
  • the photocatalyst particles flowing in the liquid to be treated absorb the light energy of the ultraviolet lamp installed in the reaction tank and cause a photocatalytic reaction, and the radicals generated by this photocatalytic reaction oxidize the dissolved substances in the liquid to be treated. decomposed.
  • the treatment liquid after oxidative decomposition is separated into photocatalyst particles and the treatment liquid by a sedimentation separation tube.
  • the treated liquid is discharged out of the system by a drainage pump.
  • Patent Document 2 describes a reaction apparatus that performs oxidative decomposition treatment of organic matter using both ultraviolet rays and an oxidizing agent.
  • This reactor comprises a vertical cylindrical reactor.
  • An inner cylindrical body is arranged vertically in the central part inside the reaction vessel.
  • the inner cylindrical body is a cylindrical body whose upper and lower ends are open.
  • An impeller is arranged inside the inner cylindrical body. The impeller is fixed to the lower end of the shaft of the axial agitator.
  • a plurality of ultraviolet lamps are arranged between the inner cylindrical body and the inner wall of the reaction vessel.
  • Water to be treated is introduced into the reaction tank.
  • An oxidizing agent is added to the water to be treated.
  • the water to be treated is circulated by the operation of an axial flow pump constituted by an inner cylindrical body and an axial flow stirrer, and is irradiated with ultraviolet rays from an ultraviolet lamp to undergo ultraviolet reaction treatment.
  • the present disclosure provides an advantageous food processing apparatus from the viewpoint of shortening the processing time using photocatalysts.
  • the food processing apparatus of the present disclosure includes: a reaction vessel in which a liquid reactant for food is stored; a rotatable agitator for agitating the reactants stored in the reaction vessel; a plurality of catalyst-attached members arranged apart from each other around the rotation axis of the stirrer inside the reaction vessel; each of the plurality of catalyzed members comprises a light source and a tube; the tube has an outer surface on which a photocatalyst resides, houses the light source, and is transmissive to light from the light source;
  • the stirrer satisfies the following condition (I), the following condition (II), or the following conditions (I) and (II).
  • the diameter of the circle which is the trajectory formed by the outermost end of the stirring body in the direction perpendicular to the rotation axis when the stirring body rotates, is perpendicular to the rotation axis of the plurality of members with catalyst. is greater than or equal to the maximum dimension in any direction.
  • the agitator pushes the reactants toward the bottom of the reactor in a direction parallel to the axis of rotation as the agitator rotates.
  • the food processing apparatus of the present disclosure is advantageous from the viewpoint of shortening processing time using photocatalysts.
  • FIG. 1 is a plan view showing an example of a food processing apparatus according to an embodiment.
  • FIG. 2 is a cross-sectional view of the food processing apparatus taken along line II-II in FIG. 3 is a side view of a stirring blade of the food processing apparatus in FIG. 1.
  • FIG. 4 is a plan view schematically showing an analysis model of the food processing apparatus for calculation in the example.
  • FIG. 5 is a cross-sectional view of the analysis model taken along line VV in FIG.
  • Reactant means a substance that participates in and is changed by a chemical reaction.
  • a catalyst-attached member comprising a tube having an outer surface on which a photocatalyst is present and a light source housed inside the tube. be done. In this case, light from the light source is transmitted through the tube while certain components of the liquid reactant are transported toward the outer surface of the tube. In this state, reactions occur on the outer surface of the tube to process the reactants by photocatalysis.
  • FIG. 1 is a plan view schematically showing a food processing apparatus 1a according to an embodiment.
  • FIG. 2 is a sectional view of the food processing apparatus 1a taken along line II-II in FIG.
  • the food processing apparatus 1a includes a reaction tank 10, an agitator 20, and a plurality of members 30 with a catalyst.
  • a liquid reactant 5 for food is stored in the reaction tank 10 .
  • the agitator 20 agitates the reactants 5 stored in the reaction tank 10 by its rotation.
  • the dashed arrow indicates the direction of rotation of the stirrer 20 .
  • a plurality of catalyst-attached members 30 are arranged around the rotation axis Ax of the stirring body 20 inside the reaction tank 10 , apart from each other.
  • each of the plurality of catalyzed members 30 includes a light source 32 and a tube 34 .
  • Tube 34 has an outer surface 34c on which photocatalyst resides.
  • Tube 34 houses light source 32 .
  • Tube 34 transmits light from light source 32 .
  • the stirrer 20 satisfies the following condition (I), the following condition (II), or the following conditions (I) and (II).
  • the diameter D20 of the circle which is the trajectory L20 formed by the outermost end 20e of the stirring body 20 in the direction perpendicular to the rotation axis Ax when the stirring body 20 rotates, is equal to or greater than the maximum dimension D30 . .
  • the maximum dimension D30 is the maximum dimension in the direction perpendicular to the rotation axis Ax of the member group formed by the plurality of members 30 with catalyst.
  • the agitator 20 pushes the reactants 5 toward the bottom 10b of the reaction vessel 10 in a direction parallel to the axis of rotation Ax when the agitator 20 rotates.
  • the reactant 5 is stored in the reaction vessel 10 so as to be in contact with the outer surface 34c of the tube 34.
  • the tube 34 comprises, for example, a support 34a and a catalyst layer 34b.
  • the catalyst layer 34b forms the outer surface 34c of the tube 34 and contains a photocatalyst.
  • the support 34a supports the catalyst layer 34b.
  • the support 34a is arranged between the light source 32 and the catalyst layer 34b in the thickness direction of the catalyst layer 34b.
  • the light emitted from the light source 32 is not limited to light with a specific wavelength.
  • the light source 32 emits ultraviolet light, for example.
  • Light source 32 emits light having a central wavelength of, for example, 260 to 400 nm.
  • Light source 32 may emit light having a center wavelength of 365 nm.
  • Light source 32 is not limited to any particular aspect.
  • the light source 32 may be a Light Emitting Diode (LED), a high pressure mercury lamp, a low pressure mercury lamp, or a fluorescent lamp.
  • LED Light Emitting Diode
  • the ultraviolet light emitted from the light source 32 passes through the support 34a of the tube 34 and irradiates the catalyst layer 34b. Therefore, the photocatalyst existing on the outer surface 34c is activated in the entire catalyst layer 34b. As a result, a chemical reaction for processing the reactant 5 can selectively proceed at the interface between the reactant 5 and the member 30 with catalyst.
  • the reaction efficiency ⁇ of a given chemical reaction on the photocatalyst surface can be maximized, for example, according to the following method.
  • the reaction efficiency ⁇ is a physical quantity obtained by dividing the number of reactions N by the total energy E T applied to the system.
  • the total input energy E T is the sum of the electric energy E 1 [W] required for causing the light source 32 to emit light and the energy E 2 [W] required for rotating the stirrer 20 .
  • the irradiation speed k ⁇ b>1 [photons/second] of photons irradiated from the light source 32 to the catalyst layer 34 b can be adjusted by the emission intensity of the light source 32 .
  • the transport speed k2 [molecules/sec] of the predetermined component transported from the reactant 5 to the outer surface 34c can be adjusted by the number of revolutions of the stirrer 20.
  • the irradiation speed k1 and the transport speed k2 are the same, energy is not wasted and the reaction efficiency ⁇ can take the best value.
  • the stirring body 20 does not satisfy the following condition (I), the following condition (II), or the following conditions (I) and (II), even if the rotation speed of the stirring body 20 is increased, It is difficult to adjust the transportation speed k2 to a high value.
  • the concentration C bulk of a given component in the bulk region of the reactant 5 is equal to the concentration macroscopically calculated from the input amount of the given component in the reactant 5 when the reactant 5 is well agitated.
  • concentration C surface of the predetermined component on the outer surface 34c is consumed by the reaction involving the predetermined component and is greatly reduced from the concentration C bulk .
  • concentration C surface is close to zero.
  • Substance transport accompanying concentration diffusion in the boundary film layer becomes a bottleneck for improving the transport speed k2. This is because the mass transport rate due to concentration diffusion in the boundary film layer is much smaller than the mass transport rate due to convection.
  • Convection occurs due to the rotation of the stirrer 20 .
  • This convection causes a shear stress ⁇ on the outer surface 34c.
  • the shear stress ⁇ at the outer surface 34c is correlated with the thickness L of the boundary film layer, and is understood to be a convenient index for indirectly evaluating the thickness L of the boundary film layer.
  • the shear stress ⁇ at the outer surface 34c increases, the thickness L of the boundary film layer tends to decrease, and as the shear stress ⁇ further increases, the decrease in the thickness L approaches its limit.
  • the shear stress ⁇ at the outer surface 34c when the reactants 5 are stirred by the rotation of the stirrer 20 can be calculated, for example, according to computational fluid dynamics.
  • the average shear stress ⁇ AVG in a minute region of the outer surface 34c tends to increase.
  • the thickness of the boundary film layer relating to substance transport to the outer surface 34c of the predetermined component of the reactant 5 involved in the reaction on the outer surface 34c tends to be small.
  • the time required for processing the reactant 5 in the food processing apparatus 1a tends to be shortened.
  • the maximum dimension D30 is determined based on the member group including all the catalyst-equipped members 30 in the food processing apparatus 1a.
  • the maximum dimension D30 is, for example, equal to the diameter of the cylinder with the smallest cross-sectional area circumscribing the group.
  • the relationship between the diameter D20 and the maximum dimension D30 is not limited to a specific relationship as long as the diameter D20 is equal to or greater than the maximum dimension D30 .
  • the ratio D20 / D30 of the diameter D20 to the maximum dimension D30 may be, for example , 1.01 or more, 1.02 or more, 1.03 or more, or 1 It may be 0.04 or more, or 1.05 or more.
  • the diameter D20 is smaller than the inner diameter D10 , which is the internal dimension of the reactor 10 in the direction perpendicular to the axis of rotation Ax.
  • the relationship between the maximum dimension D30 and the inner diameter D10 is not limited to a specific relationship.
  • the ratio D30 / D10 of the maximum dimension D30 to the inner diameter D10 is, for example, 0.6 or more, may be 0.8 or more, or may be 0.9 or more. In this case, the average value ⁇ AVG of the shear stress in minute regions of the outer surface 34c tends to increase.
  • the stirrer 20 rotates so as to generate a negative angular velocity vector when viewed from the bottom 10b of the reaction vessel 10, for example.
  • the upward direction from the bottom 10b of the reaction vessel 10 in the direction parallel to the rotation axis Ax corresponds to the direction of the positive angular velocity vector.
  • condition (II) is likely to be satisfied.
  • the photocatalyst present on outer surface 34c is not limited to any particular photocatalyst.
  • the photocatalyst is, for example, a titanium oxide such as TiO2 .
  • the catalyst layer 34b can be formed, for example, by a sol-gel method.
  • the material forming the support 34a is not limited to a specific material. The material is, for example, glass.
  • the tube 34 is, for example, a circular tube with a bottom.
  • the bottom and opposite sides of the tube 34 in the longitudinal direction are open.
  • a cap 35 is attached to the opening of the tube 34 to seal the inside of the tube 34 .
  • the reactant 5 can flow along the longitudinal direction of the tube 34 when the stirrer 20 rotates. Such a flow of the reactant 5 tends to increase the shear stress on the outer surface 34c.
  • the stirring body 20 has stirring blades 24, for example.
  • the shape of the stirring blade 24 is not limited to a specific shape.
  • the stirring blade 24 has, for example, an outermost end 20e.
  • FIG. 3 is a side view showing the stirring blade 24 when the stirring blade 24 is viewed from the outermost end 20e along the direction perpendicular to the rotation axis Ax.
  • the stirring blade 24 has, for example, an upper end 24t and a lower end 24b in addition to the outermost end 20e.
  • the dashed arrow in FIG. 3 indicates the rotation direction of the stirring body 20 .
  • the upper end 24t and the lower end 24b are arranged in the order of the lower end 24t and the upper end 24b in the rotation direction of the stirring body 20.
  • the lower end portion 24b is located on the bottom 10b side of the reaction vessel 10 . Therefore, the reactants 5 are easily pushed out toward the bottom 10b of the reaction tank 10 by the stirring blades 24, and the above condition (II) is easily satisfied in the food processing apparatus 1a.
  • the normal line N is not limited to a specific value.
  • the angle ⁇ is, for example, 30° or more, may be 40° or more, or may be 45° or more.
  • the angle ⁇ is 90° or less, may be 80° or less, may be 70° or less, or may be 60° or less.
  • the stirring body 20 further includes a shaft 22.
  • a stirring blade 24 is attached to the shaft 22 .
  • the shaft 22 is connected to, for example, a motor (not shown), and the stirring body 20 is rotated by the operation of the motor.
  • the number of stirring blades 24 in stirring body 20 is not limited to a specific value. As shown in FIG. 2, the stirring body 20 has four stirring blades 24, for example. The number of stirring blades 24 in the stirring body 20 may be 1, 2, 3, or 5 or more.
  • the stirring body 20 has a plurality of stirring blades 24, the positions of the plurality of stirring blades 24 in the direction parallel to the rotation axis Ax may be the same or different.
  • the position of the stirrer 20 in the reaction tank 10 is not limited to a specific position. As shown in FIG. 2, the stirrer 20 is arranged between the plurality of catalyst-attached members 30 and the bottom 10b of the reaction tank 10 in the direction parallel to the rotation axis Ax. With such a configuration, the reactant 5 is more likely to flow along the longitudinal direction of the tube 34 when the stirrer 20 rotates. Therefore, the shear stress on the outer surface 34c tends to increase.
  • the arrangement of the plurality of catalyst-attached members 30 in the reaction tank 10 is not limited to a specific arrangement.
  • the plurality of catalyst-attached members 30 includes, for example, a first group 30a and a second group 30b.
  • the first group 30a consists of a plurality of catalyst-equipped members 30 having the same shortest distance from the rotation axis Ax around the rotation axis Ax.
  • the second group 30b is arranged outside the first group 30a around the rotation axis Ax, and consists of a plurality of catalyst-equipped members 30 having the same shortest distance from the rotation axis Ax. According to such a configuration, a plurality of catalyst-attached members 30 can be present at high density in the reaction tank 10 .
  • the possibility of transporting the predetermined component in the reactant 5 to the outer surface 34c increases, and the time required for processing the reactant 5 tends to be shortened.
  • the shear stress on the outer surfaces 34c of the plurality of members 30 with catalyst belonging to the first group 30a tends to be uniform
  • the shear stress on the outer surfaces 34c of the members 30 with catalyst belonging to the second group 30b tends to be uniform.
  • the number of members 30 with a catalyst belonging to the first group 30a and the number of members 30 with a catalyst belonging to the second group 30b are not limited to specific values.
  • the number of members 30 with a catalyst belonging to the second group 30b is, for example, greater than the number of members 30 with a catalyst belonging to the first group 30a.
  • the high shear stress on the outer surfaces 34c of the plurality of catalyst-attached members 30 belonging to the second group 30b is very advantageous from the viewpoint of shortening the time required for processing the reactant 5.
  • the first group 30a includes, for example, six catalyst-attached members 30, and these catalyst-attached members 30 are arranged around the rotation axis Ax at equal intervals.
  • the second group 30b includes, for example, 12 catalyst-attached members 30, and these catalyst-attached members 30 are arranged around the rotation axis Ax at equal intervals.
  • the plurality of catalyst-attached members 30 further includes, for example, a third group 30c.
  • the third group 30c is arranged outside the second group 30b around the rotation axis Ax, and consists of a plurality of catalyst-equipped members 30 having the same shortest distance from the rotation axis Ax.
  • the third group 30c includes, for example, 18 catalyst-attached members 30. As shown in FIG.
  • the liquid reactant 5 is not limited to a specific liquid.
  • the reactant 5 may be a liquid used for producing alcoholic beverages, a liquid used for beverages other than alcoholic beverages, or a liquid used for producing seasonings.
  • may Reactant 5 may be a liquid used in the manufacture of food products other than beverages and condiments.
  • the food processing apparatus of the present disclosure will be described in more detail with examples. It should be noted that the food processing apparatus of the present disclosure is not limited to the following examples.
  • FIG. 4 is a plan view schematically showing the analysis model 50 of the food processing apparatus in the example.
  • FIG. 5 is a cross-sectional view of the analysis model 50 taken along line VV in FIG.
  • Fluent 2020 R1 from Ansys was used to perform calculations according to computational fluid dynamics for the analysis model 50 shown in FIGS. 4 and 5 .
  • Ansys Space Claim was used for the structural design of the analytical model 50 in this calculation, and Ansys Meshing was used for creating the mesh of the analytical model 50 .
  • Ansys Fluent was used to perform this calculation.
  • the behavior of the analysis model 50 accompanying the rotation of the stirrer 20 was analyzed using the multiple reference coordinate model. With the multiple reference coordinate model, no mesh movement is required for steady-state calculations.
  • CFD Post was used to analyze the calculation results. By this analysis, the average value ⁇ AVG of the shear stress in each minute region of the outer surface 34c of the catalyst-attached member 30 was calculated.
  • the stirring energy was calculated from the torque applied to the stirring blades 24 of the stirring body 20 and the rotation speed of the stirring body 20 .
  • the inner diameter ⁇ v of the reaction vessel 10 was 540 mm, and the height from the bottom 10b of the reaction vessel 10 was 311 mm.
  • 18 catalyst-attached members 30 were arranged inside the reaction tank 10 .
  • These catalyst-equipped members 30 included a first group 30a consisting of six catalyst-equipped members 30 and a second group 30b consisting of twelve catalyst-equipped members 30 .
  • Eighteen catalyst-attached members 30 belonging to the first group 30a and the second group 30b were arranged along two concentric circles in plan view.
  • the six catalyst-attached members 30 belonging to the first group 30a were arranged at regular intervals along the circumference of a circle having a diameter ⁇ P1 of 180 mm.
  • each stirring blade 24 of the stirrer 20 was a flat plate having a width of 50 mm and a thickness of 2 mm.
  • the stirring body 20 had four stirring blades 24 , and the four stirring blades 24 were arranged around the rotation axis of the stirring body 20 at regular intervals.
  • the trajectory formed by the outermost end 20e of the stirring body 20 when the stirring body 20 was rotated was a circle.
  • An average value ⁇ AVG of shear stress in each minute region of the outer surface of the catalyst-attached member 30 was calculated when the diameter D 20 of the circle was 384 mm, 408 mm, 432 mm, 456 mm, and 480 mm.
  • the center of the stirring blade 24 in the direction parallel to the rotation axis of the stirring body 20 was located at a height of 65 mm from the bottom 10b of the reaction vessel 10.
  • the angle ⁇ between the normal line N of the upper surface of each stirring blade 24 and the rotation axis of the stirring body 20 was 45°.
  • the stirrer 20 was rotated so as to generate a negative angular velocity vector when viewed from the bottom 10b of the reaction vessel 10 in the calculations using the analytical model 50, except for the parts that are particularly described.
  • the upward direction from the bottom 10b of the reaction vessel 10 in the direction parallel to the rotation axis of the stirring body 20 corresponds to the direction of the positive angular velocity vector.
  • the rotation speed of the stirrer 20 was 3.142 radians/sec.
  • the volume of reactant 5 is 0.06 m3
  • the density of reactant 5 ranges from 1000 kg/ m3 to 1010 kg/ m3
  • the viscosity of reactant 5 is It was 1.52 mPas.
  • Table 1 shows the calculation results of the average value ⁇ AVG of the shear stress in each minute region of the outer surface 34c of the catalyst-attached member 30 when the diameter D20 is 384 mm, 408 mm, 432 mm, 456 mm, and 480 mm in the analysis model 50. show.
  • ⁇ AVG1 is the average value of the shear stress on the outer surface 34 c of the member 30 with the catalyst belonging to the first group 30 a
  • ⁇ AVG2 is the shear stress on the outer surface 34 c of the member 30 with the catalyst belonging to the second group 30 b. is the average value of It was confirmed that ⁇ AVG2 increases significantly as the diameter D 20 increases.
  • the ratio of the increment of ⁇ AVG2 to the increment of the diameter D 20 varies greatly between the case where the diameter D 20 is 432 mm or less and the case where the diameter D 20 is larger than 432 mm. It can be seen that the ratio of increments of ⁇ AVG2 to increments of diameter D 20 increases when diameter D 20 is greater than 432 mm.
  • the sum of the diameter ⁇ P2 and the outer diameter ⁇ S is 434 mm. This sum corresponds to the maximum dimension D 30 of the member group consisting of the 18 catalyst-attached members 30 in the direction perpendicular to the rotation axis of the stirring body 20 . Therefore, it is understood that the relationship between the diameter D20 and the maximum dimension D30 is important in order to increase the average shear stress ⁇ AVG2 on the outer surface 34c of the catalyst-attached member 30 belonging to the second group 30b. .
  • FIGS. 4 and 5 schematically show the state of convection of the reactant 5 in the reaction vessel 10 .
  • FIG. 5 between the catalyst-attached member 30 belonging to the second group 30b and the inner wall of the reaction tank 10, strong convection was generated from the bottom to the top of the reaction tank 10.
  • FIG. 4 strong convection was generated in the upper part of the reaction vessel 10 toward the center of the reaction vessel 10 .
  • a strong convection was generated from the top to the bottom of the reaction tank 10 inside the catalyst-attached member 30 belonging to the first group 30a.
  • the average value of the shear stress in the outer surface 34c of the catalyst-attached member 30 was calculated when the rotation direction of the stirrer 20 was changed under the condition that the diameter D20 was 480 mm.
  • Table 2 shows the results.
  • the rotation speed of the stirrer 20 was 3.142 radians/sec.
  • the average value ⁇ AVG2 increases compared to when a positive angular velocity vector is generated.
  • the flow velocity vector of the reactant 5 caused by the rotation of the stirrer 20 was analyzed.
  • the stirrer 20 rotates so as to generate a negative angular velocity vector when viewed from the bottom 10b of the reaction vessel 10, the circulatory convection indicated by the dashed arrows in FIGS . It turned out to be big.
  • the food processing apparatus of the present disclosure is useful in processing liquid reactants for food.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

Ce dispositif de transformation d'aliment (1a) comprend un récipient de réaction (10), un corps d'agitation (20) et une pluralité d'éléments sur lesquels est fixé un catalyseur (30). Le récipient de réaction (10) stocke un réactif liquide (5) destiné à des aliments. Le corps d'agitation (20), par rotation, agite le réactif (5) stocké dans le récipient de réaction (10). Les éléments sur lesquels est fixé un catalyseur (30) présentent chacun une surface externe sur laquelle un photocatalyseur est présent. Le dispositif de transformation d'aliment (1a) satisfait la condition (I) ci-dessous, la condition (II) ci-dessous, ou les conditions (I) et (II) ci-dessous. (I) Le diamètre D20 d'un cercle qui est un lieu L20 formé par une extrémité la plus à l'extérieur (20e) du corps d'agitation (20) dans une direction perpendiculaire à un axe de rotation Ax lorsque le corps d'agitation (20) tourne correspond au moins à une dimension maximale D30. (II) le corps d'agitation (20) pousse le réactif (5) vers un fond (10b) du récipient de réaction (10) dans une direction parallèle à l'axe de rotation Ax lorsque le corps d'agitation (20) tourne.
PCT/JP2022/029611 2021-08-30 2022-08-02 Dispositif de transformation d'aliment WO2023032560A1 (fr)

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CA3228781A CA3228781A1 (fr) 2021-08-30 2022-08-02 Dispositif de transformation d'aliment
US18/444,613 US20240245078A1 (en) 2021-08-30 2024-02-16 Food processing apparatus

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US20240245078A1 (en) 2024-07-25
CA3228781A1 (fr) 2023-03-09
EP4397191A1 (fr) 2024-07-10

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